class Settings():
    """存储《外星人入侵》 的所有设置的类"""
    def __init__(self):
        """初始化游戏的设置"""
        # 屏幕设置
        self.screen_width = 1400
        self.screen_height = 600
        self.bg_color = (230, 230, 230)

        # 飞船设置
        self.ship_speed_factor = 1.5
        self.ship_limit = 3

        # 子弹设置
        self.bullet_speed_factor = 3
        self.bullet_width = 300
        self.bullet_height = 30
        self.bullet_color = 160, 60, 80
        self.bullets_allowed = 9

        # 外星人设置
        self.alien_speed_factor = 10
        self.fleet_drop_speed = 20
        # fleet_direction为1表示向右移， 为-1表示向左移
        self.fleet_direction = 1